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8931b30d DSH |
1 | /* crypto/cms/cms_env.c */ |
2 | /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL | |
3 | * project. | |
4 | */ | |
5 | /* ==================================================================== | |
6 | * Copyright (c) 2008 The OpenSSL Project. All rights reserved. | |
7 | * | |
8 | * Redistribution and use in source and binary forms, with or without | |
9 | * modification, are permitted provided that the following conditions | |
10 | * are met: | |
11 | * | |
12 | * 1. Redistributions of source code must retain the above copyright | |
13 | * notice, this list of conditions and the following disclaimer. | |
14 | * | |
15 | * 2. Redistributions in binary form must reproduce the above copyright | |
16 | * notice, this list of conditions and the following disclaimer in | |
17 | * the documentation and/or other materials provided with the | |
18 | * distribution. | |
19 | * | |
20 | * 3. All advertising materials mentioning features or use of this | |
21 | * software must display the following acknowledgment: | |
22 | * "This product includes software developed by the OpenSSL Project | |
23 | * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" | |
24 | * | |
25 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | |
26 | * endorse or promote products derived from this software without | |
27 | * prior written permission. For written permission, please contact | |
28 | * licensing@OpenSSL.org. | |
29 | * | |
30 | * 5. Products derived from this software may not be called "OpenSSL" | |
31 | * nor may "OpenSSL" appear in their names without prior written | |
32 | * permission of the OpenSSL Project. | |
33 | * | |
34 | * 6. Redistributions of any form whatsoever must retain the following | |
35 | * acknowledgment: | |
36 | * "This product includes software developed by the OpenSSL Project | |
37 | * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" | |
38 | * | |
39 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY | |
40 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
41 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
42 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR | |
43 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
44 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
45 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
46 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
47 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
48 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
49 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
50 | * OF THE POSSIBILITY OF SUCH DAMAGE. | |
51 | * ==================================================================== | |
52 | */ | |
53 | ||
54 | #include "cryptlib.h" | |
55 | #include <openssl/asn1t.h> | |
56 | #include <openssl/pem.h> | |
57 | #include <openssl/x509v3.h> | |
58 | #include <openssl/err.h> | |
59 | #include <openssl/cms.h> | |
5c4436c9 | 60 | #include <openssl/rand.h> |
6e3bc4f0 | 61 | #include <openssl/aes.h> |
8931b30d DSH |
62 | #include "cms_lcl.h" |
63 | #include "asn1_locl.h" | |
64 | ||
65 | /* CMS EnvelopedData Utilities */ | |
66 | ||
67 | DECLARE_ASN1_ITEM(CMS_EnvelopedData) | |
8931b30d | 68 | DECLARE_ASN1_ITEM(CMS_KeyTransRecipientInfo) |
c36e936b DSH |
69 | DECLARE_ASN1_ITEM(CMS_KEKRecipientInfo) |
70 | DECLARE_ASN1_ITEM(CMS_OtherKeyAttribute) | |
8931b30d | 71 | |
8931b30d DSH |
72 | DECLARE_STACK_OF(CMS_RecipientInfo) |
73 | ||
d2a53c22 | 74 | CMS_EnvelopedData *cms_get0_enveloped(CMS_ContentInfo *cms) |
8931b30d DSH |
75 | { |
76 | if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_enveloped) | |
77 | { | |
78 | CMSerr(CMS_F_CMS_GET0_ENVELOPED, | |
79 | CMS_R_CONTENT_TYPE_NOT_ENVELOPED_DATA); | |
80 | return NULL; | |
81 | } | |
82 | return cms->d.envelopedData; | |
83 | } | |
84 | ||
85 | static CMS_EnvelopedData *cms_enveloped_data_init(CMS_ContentInfo *cms) | |
86 | { | |
87 | if (cms->d.other == NULL) | |
88 | { | |
89 | cms->d.envelopedData = M_ASN1_new_of(CMS_EnvelopedData); | |
90 | if (!cms->d.envelopedData) | |
91 | { | |
92 | CMSerr(CMS_F_CMS_ENVELOPED_DATA_INIT, | |
93 | ERR_R_MALLOC_FAILURE); | |
94 | return NULL; | |
95 | } | |
96 | cms->d.envelopedData->version = 0; | |
97 | cms->d.envelopedData->encryptedContentInfo->contentType = | |
98 | OBJ_nid2obj(NID_pkcs7_data); | |
99 | ASN1_OBJECT_free(cms->contentType); | |
100 | cms->contentType = OBJ_nid2obj(NID_pkcs7_enveloped); | |
101 | return cms->d.envelopedData; | |
102 | } | |
103 | return cms_get0_enveloped(cms); | |
104 | } | |
105 | ||
4f1aa191 DSH |
106 | STACK_OF(CMS_RecipientInfo) *CMS_get0_RecipientInfos(CMS_ContentInfo *cms) |
107 | { | |
108 | CMS_EnvelopedData *env; | |
761ffa72 | 109 | env = cms_get0_enveloped(cms); |
4f1aa191 DSH |
110 | if (!env) |
111 | return NULL; | |
112 | return env->recipientInfos; | |
113 | } | |
114 | ||
115 | int CMS_RecipientInfo_type(CMS_RecipientInfo *ri) | |
116 | { | |
117 | return ri->type; | |
118 | } | |
119 | ||
761ffa72 DSH |
120 | CMS_ContentInfo *CMS_EnvelopedData_create(const EVP_CIPHER *cipher) |
121 | { | |
122 | CMS_ContentInfo *cms; | |
123 | CMS_EnvelopedData *env; | |
124 | cms = CMS_ContentInfo_new(); | |
125 | if (!cms) | |
126 | goto merr; | |
127 | env = cms_enveloped_data_init(cms); | |
128 | if (!env) | |
129 | goto merr; | |
130 | if (!cms_EncryptedContent_init(env->encryptedContentInfo, | |
131 | cipher, NULL, 0)) | |
132 | goto merr; | |
133 | return cms; | |
134 | merr: | |
135 | if (cms) | |
136 | CMS_ContentInfo_free(cms); | |
137 | CMSerr(CMS_F_CMS_ENVELOPEDDATA_CREATE, ERR_R_MALLOC_FAILURE); | |
138 | return NULL; | |
139 | } | |
140 | ||
ab124380 DSH |
141 | /* Key Transport Recipient Info (KTRI) routines */ |
142 | ||
8931b30d DSH |
143 | /* Add a recipient certificate. For now only handle key transport. |
144 | * If we ever handle key agreement will need updating. | |
145 | */ | |
ab124380 | 146 | |
8931b30d DSH |
147 | CMS_RecipientInfo *CMS_add1_recipient_cert(CMS_ContentInfo *cms, |
148 | X509 *recip, unsigned int flags) | |
149 | { | |
150 | CMS_RecipientInfo *ri = NULL; | |
151 | CMS_KeyTransRecipientInfo *ktri; | |
152 | CMS_EnvelopedData *env; | |
153 | EVP_PKEY *pk = NULL; | |
154 | int i, type; | |
761ffa72 | 155 | env = cms_get0_enveloped(cms); |
8931b30d DSH |
156 | if (!env) |
157 | goto err; | |
158 | ||
761ffa72 | 159 | /* Initialize recipient info */ |
8931b30d DSH |
160 | ri = M_ASN1_new_of(CMS_RecipientInfo); |
161 | if (!ri) | |
162 | goto merr; | |
163 | ||
761ffa72 | 164 | /* Initialize and add key transport recipient info */ |
8931b30d DSH |
165 | |
166 | ri->d.ktri = M_ASN1_new_of(CMS_KeyTransRecipientInfo); | |
167 | if (!ri->d.ktri) | |
168 | goto merr; | |
169 | ri->type = CMS_RECIPINFO_TRANS; | |
170 | ||
171 | ktri = ri->d.ktri; | |
172 | ||
173 | X509_check_purpose(recip, -1, -1); | |
174 | pk = X509_get_pubkey(recip); | |
175 | if (!pk) | |
176 | { | |
177 | CMSerr(CMS_F_CMS_ADD1_RECIPIENT_CERT, | |
178 | CMS_R_ERROR_GETTING_PUBLIC_KEY); | |
179 | goto err; | |
180 | } | |
181 | CRYPTO_add(&recip->references, 1, CRYPTO_LOCK_X509); | |
8931b30d DSH |
182 | ktri->pkey = pk; |
183 | ktri->recip = recip; | |
184 | ||
185 | if (flags & CMS_USE_KEYID) | |
186 | { | |
187 | ktri->version = 2; | |
188 | type = CMS_RECIPINFO_KEYIDENTIFIER; | |
189 | } | |
190 | else | |
191 | { | |
192 | ktri->version = 0; | |
193 | type = CMS_RECIPINFO_ISSUER_SERIAL; | |
194 | } | |
195 | ||
196 | /* Not a typo: RecipientIdentifier and SignerIdentifier are the | |
197 | * same structure. | |
198 | */ | |
199 | ||
200 | if (!cms_set1_SignerIdentifier(ktri->rid, recip, type)) | |
201 | goto err; | |
202 | ||
203 | if (pk->ameth && pk->ameth->pkey_ctrl) | |
204 | { | |
205 | i = pk->ameth->pkey_ctrl(pk, ASN1_PKEY_CTRL_CMS_ENVELOPE, | |
206 | 0, ri); | |
207 | if (i == -2) | |
208 | { | |
209 | CMSerr(CMS_F_CMS_ADD1_RECIPIENT_CERT, | |
210 | CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE); | |
211 | goto err; | |
212 | } | |
213 | if (i <= 0) | |
214 | { | |
215 | CMSerr(CMS_F_CMS_ADD1_RECIPIENT_CERT, | |
216 | CMS_R_CTRL_FAILURE); | |
217 | goto err; | |
218 | } | |
219 | } | |
220 | ||
221 | if (!sk_CMS_RecipientInfo_push(env->recipientInfos, ri)) | |
222 | goto merr; | |
223 | ||
224 | return ri; | |
225 | ||
226 | merr: | |
227 | CMSerr(CMS_F_CMS_ADD1_RECIPIENT_CERT, ERR_R_MALLOC_FAILURE); | |
228 | err: | |
229 | if (ri) | |
230 | M_ASN1_free_of(ri, CMS_RecipientInfo); | |
231 | return NULL; | |
232 | ||
233 | } | |
234 | ||
235 | int CMS_RecipientInfo_ktri_get0_algs(CMS_RecipientInfo *ri, | |
236 | EVP_PKEY **pk, X509 **recip, | |
237 | X509_ALGOR **palg) | |
238 | { | |
239 | CMS_KeyTransRecipientInfo *ktri; | |
240 | if (ri->type != CMS_RECIPINFO_TRANS) | |
241 | { | |
242 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_GET0_ALGS, | |
243 | CMS_R_NOT_KEY_TRANSPORT); | |
244 | return 0; | |
245 | } | |
246 | ||
247 | ktri = ri->d.ktri; | |
248 | ||
249 | if (pk) | |
250 | *pk = ktri->pkey; | |
251 | if (recip) | |
252 | *recip = ktri->recip; | |
253 | if (palg) | |
254 | *palg = ktri->keyEncryptionAlgorithm; | |
255 | return 1; | |
256 | } | |
257 | ||
258 | int CMS_RecipientInfo_ktri_get0_signer_id(CMS_RecipientInfo *ri, | |
259 | ASN1_OCTET_STRING **keyid, | |
260 | X509_NAME **issuer, ASN1_INTEGER **sno) | |
261 | { | |
262 | CMS_KeyTransRecipientInfo *ktri; | |
263 | if (ri->type != CMS_RECIPINFO_TRANS) | |
264 | { | |
265 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_GET0_SIGNER_ID, | |
266 | CMS_R_NOT_KEY_TRANSPORT); | |
267 | return 0; | |
268 | } | |
4f1aa191 | 269 | ktri = ri->d.ktri; |
8931b30d DSH |
270 | |
271 | return cms_SignerIdentifier_get0_signer_id(ktri->rid, | |
272 | keyid, issuer, sno); | |
273 | } | |
274 | ||
275 | int CMS_RecipientInfo_ktri_cert_cmp(CMS_RecipientInfo *ri, X509 *cert) | |
276 | { | |
8931b30d DSH |
277 | if (ri->type != CMS_RECIPINFO_TRANS) |
278 | { | |
279 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_CERT_CMP, | |
280 | CMS_R_NOT_KEY_TRANSPORT); | |
4f1aa191 DSH |
281 | return -2; |
282 | } | |
4f1aa191 DSH |
283 | return cms_SignerIdentifier_cert_cmp(ri->d.ktri->rid, cert); |
284 | } | |
285 | ||
6e3bc4f0 DSH |
286 | int CMS_RecipientInfo_set0_pkey(CMS_RecipientInfo *ri, EVP_PKEY *pkey) |
287 | { | |
288 | if (ri->type != CMS_RECIPINFO_TRANS) | |
289 | { | |
290 | CMSerr(CMS_F_CMS_RECIPIENTINFO_SET0_PKEY, | |
291 | CMS_R_NOT_KEY_TRANSPORT); | |
292 | return 0; | |
293 | } | |
294 | ri->d.ktri->pkey = pkey; | |
295 | return 1; | |
296 | } | |
297 | ||
761ffa72 DSH |
298 | /* Encrypt content key in key transport recipient info */ |
299 | ||
300 | static int cms_RecipientInfo_ktri_encrypt(CMS_ContentInfo *cms, | |
301 | CMS_RecipientInfo *ri) | |
302 | { | |
303 | CMS_KeyTransRecipientInfo *ktri; | |
304 | CMS_EncryptedContentInfo *ec; | |
305 | EVP_PKEY_CTX *pctx = NULL; | |
306 | unsigned char *ek = NULL; | |
307 | size_t eklen; | |
308 | ||
309 | int ret = 0; | |
310 | ||
311 | if (ri->type != CMS_RECIPINFO_TRANS) | |
312 | { | |
313 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_ENCRYPT, | |
314 | CMS_R_NOT_KEY_TRANSPORT); | |
315 | return 0; | |
316 | } | |
317 | ktri = ri->d.ktri; | |
318 | ec = cms->d.envelopedData->encryptedContentInfo; | |
319 | ||
320 | pctx = EVP_PKEY_CTX_new(ktri->pkey, NULL); | |
321 | if (!pctx) | |
322 | return 0; | |
323 | ||
324 | if (EVP_PKEY_encrypt_init(pctx) <= 0) | |
325 | goto err; | |
326 | ||
327 | if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_ENCRYPT, | |
328 | EVP_PKEY_CTRL_CMS_ENCRYPT, 0, ri) <= 0) | |
329 | { | |
330 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_ENCRYPT, CMS_R_CTRL_ERROR); | |
331 | goto err; | |
332 | } | |
333 | ||
334 | if (EVP_PKEY_encrypt(pctx, NULL, &eklen, ec->key, ec->keylen) <= 0) | |
335 | goto err; | |
336 | ||
337 | ek = OPENSSL_malloc(eklen); | |
338 | ||
339 | if (ek == NULL) | |
340 | { | |
341 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_ENCRYPT, | |
342 | ERR_R_MALLOC_FAILURE); | |
343 | goto err; | |
344 | } | |
345 | ||
346 | if (EVP_PKEY_encrypt(pctx, ek, &eklen, ec->key, ec->keylen) <= 0) | |
347 | goto err; | |
348 | ||
349 | ASN1_STRING_set0(ktri->encryptedKey, ek, eklen); | |
350 | ek = NULL; | |
351 | ||
352 | ret = 1; | |
353 | ||
354 | err: | |
355 | if (pctx) | |
356 | EVP_PKEY_CTX_free(pctx); | |
357 | if (ek) | |
358 | OPENSSL_free(ek); | |
359 | return ret; | |
360 | ||
361 | } | |
362 | ||
ab124380 DSH |
363 | /* Decrypt content key from KTRI */ |
364 | ||
6e3bc4f0 DSH |
365 | static int cms_RecipientInfo_ktri_decrypt(CMS_ContentInfo *cms, |
366 | CMS_RecipientInfo *ri) | |
4f1aa191 | 367 | { |
6e3bc4f0 | 368 | CMS_KeyTransRecipientInfo *ktri = ri->d.ktri; |
4f1aa191 DSH |
369 | EVP_PKEY_CTX *pctx = NULL; |
370 | unsigned char *ek = NULL; | |
371 | size_t eklen; | |
f7e85c37 | 372 | int ret = 0; |
146b52ed DSH |
373 | CMS_EncryptedContentInfo *ec; |
374 | ec = cms->d.envelopedData->encryptedContentInfo; | |
4f1aa191 | 375 | |
6e3bc4f0 | 376 | if (ktri->pkey == NULL) |
4f1aa191 | 377 | { |
6e3bc4f0 DSH |
378 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_DECRYPT, |
379 | CMS_R_NO_PRIVATE_KEY); | |
4f1aa191 DSH |
380 | return 0; |
381 | } | |
4f1aa191 | 382 | |
6e3bc4f0 | 383 | pctx = EVP_PKEY_CTX_new(ktri->pkey, NULL); |
4f1aa191 | 384 | if (!pctx) |
8931b30d | 385 | return 0; |
4f1aa191 DSH |
386 | |
387 | if (EVP_PKEY_decrypt_init(pctx) <= 0) | |
388 | goto err; | |
389 | ||
390 | if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_DECRYPT, | |
391 | EVP_PKEY_CTRL_CMS_DECRYPT, 0, ri) <= 0) | |
392 | { | |
6e3bc4f0 | 393 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_DECRYPT, CMS_R_CTRL_ERROR); |
4f1aa191 | 394 | goto err; |
8931b30d DSH |
395 | } |
396 | ||
4f1aa191 DSH |
397 | if (EVP_PKEY_decrypt(pctx, NULL, &eklen, |
398 | ktri->encryptedKey->data, | |
399 | ktri->encryptedKey->length) <= 0) | |
400 | goto err; | |
401 | ||
402 | ek = OPENSSL_malloc(eklen); | |
403 | ||
404 | if (ek == NULL) | |
405 | { | |
6e3bc4f0 DSH |
406 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_DECRYPT, |
407 | ERR_R_MALLOC_FAILURE); | |
4f1aa191 DSH |
408 | goto err; |
409 | } | |
410 | ||
411 | if (EVP_PKEY_decrypt(pctx, ek, &eklen, | |
412 | ktri->encryptedKey->data, | |
413 | ktri->encryptedKey->length) <= 0) | |
414 | { | |
6e3bc4f0 | 415 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_DECRYPT, CMS_R_CMS_LIB); |
4f1aa191 DSH |
416 | goto err; |
417 | } | |
418 | ||
419 | ret = 1; | |
420 | ||
146b52ed DSH |
421 | if (ec->key) |
422 | { | |
423 | OPENSSL_cleanse(ec->key, ec->keylen); | |
424 | OPENSSL_free(ec->key); | |
425 | } | |
426 | ||
427 | ec->key = ek; | |
428 | ec->keylen = eklen; | |
4f1aa191 DSH |
429 | |
430 | err: | |
431 | if (pctx) | |
432 | EVP_PKEY_CTX_free(pctx); | |
433 | if (!ret && ek) | |
434 | OPENSSL_free(ek); | |
435 | ||
436 | return ret; | |
437 | } | |
438 | ||
ab124380 DSH |
439 | /* Key Encrypted Key (KEK) RecipientInfo routines */ |
440 | ||
eeb9cdfc DSH |
441 | int CMS_RecipientInfo_kekri_id_cmp(CMS_RecipientInfo *ri, |
442 | const unsigned char *id, size_t idlen) | |
443 | { | |
444 | ASN1_OCTET_STRING tmp_os; | |
445 | CMS_KEKRecipientInfo *kekri; | |
446 | if (ri->type != CMS_RECIPINFO_KEK) | |
447 | { | |
448 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ID_CMP, CMS_R_NOT_KEK); | |
449 | return -2; | |
450 | } | |
451 | kekri = ri->d.kekri; | |
452 | tmp_os.type = V_ASN1_OCTET_STRING; | |
453 | tmp_os.flags = 0; | |
454 | tmp_os.data = (unsigned char *)id; | |
455 | tmp_os.length = (int)idlen; | |
456 | return ASN1_OCTET_STRING_cmp(&tmp_os, kekri->kekid->keyIdentifier); | |
457 | } | |
458 | ||
ab124380 DSH |
459 | /* For now hard code AES key wrap info */ |
460 | ||
461 | static size_t aes_wrap_keylen(int nid) | |
462 | { | |
463 | switch (nid) | |
464 | { | |
465 | case NID_id_aes128_wrap: | |
466 | return 16; | |
467 | ||
468 | case NID_id_aes192_wrap: | |
469 | return 24; | |
470 | ||
471 | case NID_id_aes256_wrap: | |
472 | return 32; | |
473 | ||
474 | default: | |
475 | return 0; | |
476 | } | |
477 | } | |
478 | ||
479 | CMS_RecipientInfo *CMS_add0_recipient_key(CMS_ContentInfo *cms, int nid, | |
480 | unsigned char *key, size_t keylen, | |
481 | unsigned char *id, size_t idlen, | |
482 | ASN1_GENERALIZEDTIME *date, | |
483 | ASN1_OBJECT *otherTypeId, | |
484 | ASN1_TYPE *otherType) | |
485 | { | |
486 | CMS_RecipientInfo *ri = NULL; | |
487 | CMS_EnvelopedData *env; | |
488 | CMS_KEKRecipientInfo *kekri; | |
489 | env = cms_get0_enveloped(cms); | |
490 | if (!env) | |
491 | goto err; | |
492 | ||
493 | if (nid == NID_undef) | |
494 | { | |
495 | switch (keylen) | |
496 | { | |
497 | case 16: | |
498 | nid = NID_id_aes128_wrap; | |
499 | break; | |
500 | ||
501 | case 24: | |
502 | nid = NID_id_aes192_wrap; | |
503 | break; | |
504 | ||
505 | case 32: | |
506 | nid = NID_id_aes256_wrap; | |
507 | break; | |
508 | ||
509 | default: | |
510 | CMSerr(CMS_F_CMS_ADD0_RECIPIENT_KEY, | |
511 | CMS_R_INVALID_KEY_LENGTH); | |
512 | goto err; | |
513 | } | |
514 | ||
515 | } | |
516 | else | |
517 | { | |
518 | ||
519 | size_t exp_keylen = aes_wrap_keylen(nid); | |
520 | ||
521 | if (!exp_keylen) | |
522 | { | |
523 | CMSerr(CMS_F_CMS_ADD0_RECIPIENT_KEY, | |
524 | CMS_R_UNSUPPORTED_KEK_ALGORITHM); | |
525 | goto err; | |
526 | } | |
527 | ||
528 | if (keylen != exp_keylen) | |
529 | { | |
530 | CMSerr(CMS_F_CMS_ADD0_RECIPIENT_KEY, | |
531 | CMS_R_INVALID_KEY_LENGTH); | |
532 | goto err; | |
533 | } | |
534 | ||
535 | } | |
536 | ||
537 | /* Initialize recipient info */ | |
538 | ri = M_ASN1_new_of(CMS_RecipientInfo); | |
539 | if (!ri) | |
540 | goto merr; | |
541 | ||
542 | ri->d.kekri = M_ASN1_new_of(CMS_KEKRecipientInfo); | |
543 | if (!ri->d.kekri) | |
544 | goto merr; | |
545 | ri->type = CMS_RECIPINFO_KEK; | |
546 | ||
547 | kekri = ri->d.kekri; | |
548 | ||
549 | if (otherTypeId) | |
550 | { | |
551 | kekri->kekid->other = M_ASN1_new_of(CMS_OtherKeyAttribute); | |
552 | if (kekri->kekid->other == NULL) | |
553 | goto merr; | |
554 | } | |
555 | ||
556 | if (!sk_CMS_RecipientInfo_push(env->recipientInfos, ri)) | |
557 | goto merr; | |
558 | ||
559 | ||
560 | /* After this point no calls can fail */ | |
561 | ||
562 | kekri->version = 4; | |
563 | ||
564 | kekri->key = key; | |
565 | kekri->keylen = keylen; | |
566 | ||
567 | ASN1_STRING_set0(kekri->kekid->keyIdentifier, id, idlen); | |
568 | ||
569 | kekri->kekid->date = date; | |
570 | ||
571 | if (kekri->kekid->other) | |
572 | { | |
573 | kekri->kekid->other->keyAttrId = otherTypeId; | |
574 | kekri->kekid->other->keyAttr = otherType; | |
575 | } | |
576 | ||
577 | X509_ALGOR_set0(kekri->keyEncryptionAlgorithm, | |
578 | OBJ_nid2obj(nid), V_ASN1_UNDEF, NULL); | |
579 | ||
580 | return ri; | |
581 | ||
582 | merr: | |
583 | CMSerr(CMS_F_CMS_ADD0_RECIPIENT_KEY, ERR_R_MALLOC_FAILURE); | |
584 | err: | |
585 | if (ri) | |
586 | M_ASN1_free_of(ri, CMS_RecipientInfo); | |
587 | return NULL; | |
588 | ||
589 | } | |
590 | ||
591 | int CMS_RecipientInfo_kekri_get0_id(CMS_RecipientInfo *ri, | |
592 | X509_ALGOR **palg, | |
593 | ASN1_OCTET_STRING **pid, | |
594 | ASN1_GENERALIZEDTIME **pdate, | |
595 | ASN1_OBJECT **potherid, | |
596 | ASN1_TYPE **pothertype) | |
597 | { | |
598 | CMS_KEKIdentifier *rkid; | |
599 | if (ri->type != CMS_RECIPINFO_KEK) | |
600 | { | |
601 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_GET0_ID, CMS_R_NOT_KEK); | |
602 | return 0; | |
603 | } | |
604 | rkid = ri->d.kekri->kekid; | |
605 | if (palg) | |
606 | *palg = ri->d.kekri->keyEncryptionAlgorithm; | |
607 | if (pid) | |
608 | *pid = rkid->keyIdentifier; | |
609 | if (pdate) | |
610 | *pdate = rkid->date; | |
611 | if (potherid) | |
612 | { | |
613 | if (rkid->other) | |
614 | *potherid = rkid->other->keyAttrId; | |
615 | else | |
616 | *potherid = NULL; | |
617 | } | |
618 | if (pothertype) | |
619 | { | |
620 | if (rkid->other) | |
621 | *pothertype = rkid->other->keyAttr; | |
622 | else | |
623 | *pothertype = NULL; | |
624 | } | |
625 | return 1; | |
626 | } | |
ab124380 DSH |
627 | |
628 | int CMS_RecipientInfo_set0_key(CMS_RecipientInfo *ri, | |
629 | unsigned char *key, size_t keylen) | |
630 | { | |
631 | CMS_KEKRecipientInfo *kekri; | |
ab124380 DSH |
632 | if (ri->type != CMS_RECIPINFO_KEK) |
633 | { | |
634 | CMSerr(CMS_F_CMS_RECIPIENTINFO_SET0_KEY, CMS_R_NOT_KEK); | |
635 | return 0; | |
636 | } | |
eeb9cdfc | 637 | |
ab124380 | 638 | kekri = ri->d.kekri; |
ab124380 DSH |
639 | kekri->key = key; |
640 | kekri->keylen = keylen; | |
641 | return 1; | |
642 | } | |
643 | ||
6e3bc4f0 DSH |
644 | |
645 | /* Encrypt content key in KEK recipient info */ | |
646 | ||
647 | static int cms_RecipientInfo_kekri_encrypt(CMS_ContentInfo *cms, | |
648 | CMS_RecipientInfo *ri) | |
649 | { | |
650 | CMS_EncryptedContentInfo *ec; | |
651 | CMS_KEKRecipientInfo *kekri; | |
652 | AES_KEY actx; | |
653 | unsigned char *wkey = NULL; | |
654 | int wkeylen; | |
655 | int r = 0; | |
656 | ||
657 | ec = cms->d.envelopedData->encryptedContentInfo; | |
658 | ||
659 | kekri = ri->d.kekri; | |
660 | ||
661 | if (!kekri->key) | |
662 | { | |
663 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ENCRYPT, CMS_R_NO_KEY); | |
664 | return 0; | |
665 | } | |
666 | ||
667 | if (AES_set_encrypt_key(kekri->key, kekri->keylen << 3, &actx)) | |
668 | { | |
669 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ENCRYPT, | |
670 | CMS_R_ERROR_SETTING_KEY); | |
671 | goto err; | |
672 | } | |
673 | ||
674 | wkey = OPENSSL_malloc(ec->keylen + 8); | |
675 | ||
676 | if (!wkey) | |
677 | { | |
678 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ENCRYPT, | |
679 | ERR_R_MALLOC_FAILURE); | |
680 | goto err; | |
681 | } | |
682 | ||
683 | wkeylen = AES_wrap_key(&actx, NULL, wkey, ec->key, ec->keylen); | |
684 | ||
685 | if (wkeylen <= 0) | |
686 | { | |
687 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ENCRYPT, CMS_R_WRAP_ERROR); | |
688 | goto err; | |
689 | } | |
690 | ||
691 | ASN1_STRING_set0(kekri->encryptedKey, wkey, wkeylen); | |
692 | ||
693 | r = 1; | |
694 | ||
695 | err: | |
696 | ||
697 | if (!r && wkey) | |
698 | OPENSSL_free(wkey); | |
699 | OPENSSL_cleanse(&actx, sizeof(actx)); | |
700 | ||
701 | return r; | |
702 | ||
703 | } | |
704 | ||
ab124380 DSH |
705 | /* Decrypt content key in KEK recipient info */ |
706 | ||
6e3bc4f0 DSH |
707 | static int cms_RecipientInfo_kekri_decrypt(CMS_ContentInfo *cms, |
708 | CMS_RecipientInfo *ri) | |
709 | { | |
710 | CMS_EncryptedContentInfo *ec; | |
711 | CMS_KEKRecipientInfo *kekri; | |
712 | AES_KEY actx; | |
713 | unsigned char *ukey = NULL; | |
714 | int ukeylen; | |
eeb9cdfc | 715 | int r = 0, wrap_nid; |
6e3bc4f0 DSH |
716 | |
717 | ec = cms->d.envelopedData->encryptedContentInfo; | |
718 | ||
719 | kekri = ri->d.kekri; | |
720 | ||
721 | if (!kekri->key) | |
722 | { | |
723 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT, CMS_R_NO_KEY); | |
724 | return 0; | |
725 | } | |
726 | ||
eeb9cdfc DSH |
727 | wrap_nid = OBJ_obj2nid(kekri->keyEncryptionAlgorithm->algorithm); |
728 | if (aes_wrap_keylen(wrap_nid) != kekri->keylen) | |
729 | { | |
730 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT, | |
731 | CMS_R_INVALID_KEY_LENGTH); | |
732 | return 0; | |
733 | } | |
734 | ||
6e3bc4f0 DSH |
735 | /* If encrypted key length is invalid don't bother */ |
736 | ||
737 | if (kekri->encryptedKey->length < 16) | |
738 | { | |
739 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT, | |
740 | CMS_R_INVALID_ENCRYPTED_KEY_LENGTH); | |
741 | goto err; | |
742 | } | |
743 | ||
744 | if (AES_set_decrypt_key(kekri->key, kekri->keylen << 3, &actx)) | |
745 | { | |
746 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT, | |
747 | CMS_R_ERROR_SETTING_KEY); | |
748 | goto err; | |
749 | } | |
750 | ||
751 | ukey = OPENSSL_malloc(kekri->encryptedKey->length - 8); | |
752 | ||
753 | if (!ukey) | |
754 | { | |
755 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT, | |
756 | ERR_R_MALLOC_FAILURE); | |
757 | goto err; | |
758 | } | |
759 | ||
760 | ukeylen = AES_unwrap_key(&actx, NULL, ukey, | |
761 | kekri->encryptedKey->data, | |
762 | kekri->encryptedKey->length); | |
763 | ||
764 | if (ukeylen <= 0) | |
765 | { | |
766 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT, | |
767 | CMS_R_UNWRAP_ERROR); | |
768 | goto err; | |
769 | } | |
770 | ||
771 | ec->key = ukey; | |
772 | ec->keylen = ukeylen; | |
773 | ||
774 | r = 1; | |
775 | ||
776 | err: | |
777 | ||
778 | if (!r && ukey) | |
779 | OPENSSL_free(ukey); | |
780 | OPENSSL_cleanse(&actx, sizeof(actx)); | |
781 | ||
782 | return r; | |
783 | ||
784 | } | |
785 | ||
786 | int CMS_RecipientInfo_decrypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri) | |
787 | { | |
788 | switch(ri->type) | |
789 | { | |
790 | case CMS_RECIPINFO_TRANS: | |
791 | return cms_RecipientInfo_ktri_decrypt(cms, ri); | |
792 | ||
793 | case CMS_RECIPINFO_KEK: | |
794 | return cms_RecipientInfo_kekri_decrypt(cms, ri); | |
795 | ||
d2a53c22 DSH |
796 | case CMS_RECIPINFO_PASS: |
797 | return cms_RecipientInfo_pwri_crypt(cms, ri, 0); | |
798 | ||
6e3bc4f0 DSH |
799 | default: |
800 | CMSerr(CMS_F_CMS_RECIPIENTINFO_DECRYPT, | |
801 | CMS_R_UNSUPPORTED_RECPIENTINFO_TYPE); | |
802 | return 0; | |
803 | } | |
804 | } | |
805 | ||
4f1aa191 DSH |
806 | BIO *cms_EnvelopedData_init_bio(CMS_ContentInfo *cms) |
807 | { | |
808 | CMS_EncryptedContentInfo *ec; | |
761ffa72 DSH |
809 | STACK_OF(CMS_RecipientInfo) *rinfos; |
810 | CMS_RecipientInfo *ri; | |
811 | int i, r, ok = 0; | |
812 | BIO *ret; | |
813 | ||
814 | /* Get BIO first to set up key */ | |
815 | ||
4f1aa191 | 816 | ec = cms->d.envelopedData->encryptedContentInfo; |
761ffa72 DSH |
817 | ret = cms_EncryptedContent_init_bio(ec); |
818 | ||
819 | /* If error or no cipher end of processing */ | |
820 | ||
821 | if (!ret || !ec->cipher) | |
822 | return ret; | |
823 | ||
ab124380 DSH |
824 | /* Now encrypt content key according to each RecipientInfo type */ |
825 | ||
761ffa72 DSH |
826 | rinfos = cms->d.envelopedData->recipientInfos; |
827 | ||
828 | for (i = 0; i < sk_CMS_RecipientInfo_num(rinfos); i++) | |
829 | { | |
830 | ri = sk_CMS_RecipientInfo_value(rinfos, i); | |
6e3bc4f0 DSH |
831 | |
832 | switch (ri->type) | |
761ffa72 | 833 | { |
6e3bc4f0 DSH |
834 | case CMS_RECIPINFO_TRANS: |
835 | r = cms_RecipientInfo_ktri_encrypt(cms, ri); | |
836 | break; | |
837 | ||
838 | case CMS_RECIPINFO_KEK: | |
839 | r = cms_RecipientInfo_kekri_encrypt(cms, ri); | |
840 | break; | |
841 | ||
d2a53c22 DSH |
842 | case CMS_RECIPINFO_PASS: |
843 | r = cms_RecipientInfo_pwri_crypt(cms, ri, 1); | |
844 | break; | |
845 | ||
6e3bc4f0 | 846 | default: |
761ffa72 DSH |
847 | CMSerr(CMS_F_CMS_ENVELOPEDDATA_INIT_BIO, |
848 | CMS_R_UNSUPPORTED_RECIPIENT_TYPE); | |
849 | goto err; | |
850 | } | |
6e3bc4f0 | 851 | |
761ffa72 DSH |
852 | if (r <= 0) |
853 | { | |
854 | CMSerr(CMS_F_CMS_ENVELOPEDDATA_INIT_BIO, | |
855 | CMS_R_ERROR_SETTING_RECIPIENTINFO); | |
856 | goto err; | |
857 | } | |
858 | } | |
859 | ||
860 | ok = 1; | |
861 | ||
862 | err: | |
863 | ec->cipher = NULL; | |
864 | if (ec->key) | |
865 | { | |
866 | OPENSSL_cleanse(ec->key, ec->keylen); | |
867 | OPENSSL_free(ec->key); | |
868 | ec->key = NULL; | |
869 | ec->keylen = 0; | |
870 | } | |
871 | if (ok) | |
872 | return ret; | |
873 | BIO_free(ret); | |
874 | return NULL; | |
875 | ||
8931b30d | 876 | } |